Patents by Inventor Masaki Moronuki
Masaki Moronuki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10100929Abstract: The present invention provides a piston ring having excellent abrasion resistance to an aluminum alloy cylinder or cylinder liner formed of a mating material and is therefore capable of decreasing abrasion of the mating material. An exemplary piston ring has a hard carbon coating formed on an outer peripheral surface, and the hard carbon coating contains 0.5 atom % or more to less than 5 atom % of tungsten (W).Type: GrantFiled: September 1, 2014Date of Patent: October 16, 2018Assignee: KABUSHIKI KAISHA RIKENInventors: Keiji Honda, Katsuhiro Tsuji, Masaki Moronuki, Takuma Sekiya
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Patent number: 10036472Abstract: Provided is a sliding member capable of achieving excellent wear resistance and high coating adhesion under harsh sliding conditions without subjecting a base member to nitriding treatment. The sliding member includes a base member made of a steel material and a hard coating that is formed on the base member and having a surface serving at least as a sliding surface. The hard coating has a Young's modulus having a distribution to increase first in a depth direction directed from an interface between the hard coating and the base member to the surface, to become maximum at a predetermined depth, and then to decrease in the depth direction directed from the interface to the surface.Type: GrantFiled: February 28, 2017Date of Patent: July 31, 2018Assignee: KABUSHIKI KAISHA RIKENInventor: Masaki Moronuki
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Patent number: 10036345Abstract: A combination of a cylinder 62 of an internal combustion engine and a piston ring 40 for sliding an inner periphery of the cylinder, wherein at least a sliding face of the cylinder is composed of an aluminum alloy including 8 mass % to 22 mass % of Si and at least one or more particles selected from the group consisting of Si, Al2O3 and SiO2 particles each having a diameter of 3 ?m or more, and at least an outer periphery of the piston ring is coated with a hard carbon coating 14 composed only of hydrogen and carbon.Type: GrantFiled: March 5, 2013Date of Patent: July 31, 2018Assignee: Kabushiki Kaisha RikenInventors: Katsuhiro Tsuji, Akio Shinohara, Masaki Moronuki
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Publication number: 20180187781Abstract: Provided is a sliding member capable of achieving excellent wear resistance and high coating adhesion under harsh sliding conditions without subjecting a base member to nitriding treatment. The sliding member includes a base member made of a steel material and a hard coating that is formed on the base member and having a surface serving at least as a sliding surface. The hard coating has a Young's modulus having a distribution to increase first in a depth direction directed from an interface between the hard coating and the base member to the surface, to become maximum at a predetermined depth, and then to decrease in the depth direction directed from the interface to the surface.Type: ApplicationFiled: February 28, 2017Publication date: July 5, 2018Applicant: KABUSHIKI KAISHA RIKENInventor: Masaki MORONUKI
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Patent number: 9644738Abstract: To provide a combination of a cylinder made of a hypereutectic Al—Si alloy and a hard-carbon-coated piston ring both exhibiting excellent wear resistance, the piston ring is provided with a laminate coating at least on an outer peripheral sliding surface thereof; the laminate coating comprising a metal layer, a metal-containing, hard carbon layer, and a metal-free, hard carbon layer in this order from the substrate side; the laminate coating having Martens' hardness (indentation hardness) HMs of 5-13 GPa, indentation modulus E of 70-200 GPa, and a deformation ratio Rpe of 0.45 or less, which is expressed by a ratio (Wp/We) of plastic deformation energy Wp to elastic deformation energy We; and a ratio (Tmf/Tm) of the thickness Tmf of the metal-free, hard carbon layer to the thickness Tm of the metal-containing, hard carbon layer being 2-8.Type: GrantFiled: December 20, 2013Date of Patent: May 9, 2017Assignee: KABUSHIKI KAISHA RIKENInventors: Akira Kunimoto, Masaki Moronuki
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Publication number: 20160245407Abstract: The present invention provides a piston ring having excellent abrasion resistance to an aluminum alloy cylinder or cylinder liner formed of a mating material and is therefore capable of decreasing abrasion of the mating material. An exemplary piston ring has a hard carbon coating formed on an outer peripheral surface, and the hard carbon coating contains 0.5 atom % or more to less than 5 atom % of tungsten (W).Type: ApplicationFiled: September 1, 2014Publication date: August 25, 2016Inventors: Keiji HONDA, Katsuhiro TSUJI, Masaki MORONUKI, Takuma SEKIYA
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Publication number: 20160230697Abstract: To provide a combination of a cylinder bore and a piston ring having excellent scuffing resistance and wear resistance with low friction loss even under severe sliding conditions with a high load applied to an engine, by a thermal spraying technique of a cylinder bore enabling the use of a usual die-cast aluminum alloy, a thermally sprayed iron-based coating formed on a piston-ring-sliding surface of a cylinder bore, which has Rpk of less than 0.20 ?m in a surface roughness profile, is combined with a hard carbon coating formed on an outer peripheral sliding surface of the piston ring, which has Rpk of less than 0.15 ?m in a surface roughness profile, in an internal combustion engine.Type: ApplicationFiled: September 16, 2014Publication date: August 11, 2016Applicant: KABUSHIKI KAISHA RIKENInventors: Akio SHINOHARA, Masaki MORONUKI
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Patent number: 9371797Abstract: To provide a high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines, a TiN coating as thick as 10-60 ?m, in which the texture coefficient of a (220) plane is 1.1-1.8 in X-ray diffraction on the coating surface, larger than those of (111) and (200) planes, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Also, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating.Type: GrantFiled: June 21, 2012Date of Patent: June 21, 2016Assignee: KABUSHIKI KAISHA RIKENInventors: Takuma Sekiya, Yuuichi Murayama, Masayuki Sato, Yuji Shima, Junya Takahashi, Masaki Moronuki
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Patent number: 9347559Abstract: A high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines is provided. Also, to provide a piston ring with low friction for contributing to the improvement of fuel efficiency, a TiN coating as thick as 10-60 ?m, in which the texture coefficient of a (111) plane is 1.2-1.65 in X-ray diffraction on the coating surface, with the texture coefficient of a (111) plane>the texture coefficient of a (220) plane>the texture coefficient of a (200) plane, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Further, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating.Type: GrantFiled: June 21, 2012Date of Patent: May 24, 2016Assignee: KABUSHIKI KAISHA RIKENInventors: Takuma Sekiya, Yuuichi Murayama, Masayuki Sato, Yuji Shima, Junya Takahashi, Masaki Moronuki
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Publication number: 20150300493Abstract: To provide a combination of a cylinder made of a hypereutectic Al—Si alloy and a hard-carbon-coated piston ring both exhibiting excellent wear resistance, the piston ring is provided with a laminate coating at least on an outer peripheral sliding surface thereof; the laminate coating comprising a metal layer, a metal-containing, hard carbon layer, and a metal-free, hard carbon layer in this order from the substrate side; the laminate coating having Martens' hardness (indentation hardness) HMs of 5-13 GPa, indentation modulus E of 70-200 GPa, and a deformation ratio Rpe of 0.45 or less, which is expressed by a ratio (Wp/We) of plastic deformation energy Wp to elastic deformation energy We; and a ratio (Tmf/Tm) of the thickness Tmf of the metal-free, hard carbon layer to the thickness Tm of the metal-containing, hard carbon layer being 2-8.Type: ApplicationFiled: December 20, 2013Publication date: October 22, 2015Applicant: KABUSHIKI KAISHA RIKENInventors: Akira KUNIMOTO, Masaki MORONUKI
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Publication number: 20150136062Abstract: A combination of a cylinder 62 of an internal combustion engine and a piston ring 40 for sliding an inner periphery of the cylinder, wherein at least a sliding face of the cylinder is composed of an aluminum alloy including 8 mass % to 22 mass % of Si and at least one or more particles selected from the group consisting of Si, Al2O3 and SiO2 particles each having a diameter of 3 ?m or more, and at least an outer periphery of the piston ring is coated with a hard carbon coating 14 composed only of hydrogen and carbon.Type: ApplicationFiled: March 5, 2013Publication date: May 21, 2015Applicant: Kabushi Kaisha RikenInventors: Katsuhiro Tsuji, Akio Shinohara, Masaki Moronuki
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Publication number: 20140137733Abstract: To provide a high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines, a TiN coating as thick as 10-60 ?m, in which the texture coefficient of a (220) plane is 1.1-1.8 in X-ray diffraction on the coating surface, larger than those of (111) and (200) planes, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Also, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating.Type: ApplicationFiled: June 21, 2012Publication date: May 22, 2014Applicant: KABUSHIKI KAISHA RIKENInventors: Takuma Sekiya, Yuuichi Murayama, Masayuki Sato, Yuji Shima, Junya Takahashi, Masaki Moronuki
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Publication number: 20140125013Abstract: A high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines is provided. Also, to provide a piston ring with low friction for contributing to the improvement of fuel efficiency, a TiN coating as thick as 10-60 ?m, in which the texture coefficient of a (111) plane is 1.2-1.65 in X-ray diffraction on the coating surface, with the texture coefficient of a (111) plane>the texture coefficient of a (220) plane>the texture coefficient of a (200) plane, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Further, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating.Type: ApplicationFiled: June 21, 2012Publication date: May 8, 2014Applicant: KABUSHIKI KAISHA RIKENInventors: Takuma Sekiya, Yuuichi Murayama, Masayuki Sato, Yuji Shima, Junya Takahashi, Masaki Moronuki
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Patent number: 8123227Abstract: A sliding member is characterized in that a sliding surface of the sliding member is coated with an amorphous hard carbon film, and a surface of the amorphous hard carbon film has a ten-point mean roughness of equal to or less than 0.7 micrometers and an initial wear height in a range of 0.07 to 0.14 micrometers.Type: GrantFiled: August 27, 2008Date of Patent: February 28, 2012Assignee: Kabushiki Kaisha RikenInventors: Minoru Kawanishi, Ryo Wakabayashi, Masaki Moronuki, Katsuhiro Tsuji, Takayuki Sato
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Patent number: 7955691Abstract: An amorphous hard carbon film comprising a first amorphous carbon layer substantially consists only of carbon formed on a substrate surface and a second amorphous carbon layer substantially consists only of carbon formed on the surface of the first amorphous carbon layer, wherein the transmission electron microscope image of the first amorphous carbon layer is brighter than that of the second amorphous carbon layer when the cross section is observed.Type: GrantFiled: November 28, 2006Date of Patent: June 7, 2011Assignees: Kabushiki Kaisha Riken, Nippon ITF, Inc.Inventors: Masaki Moronuki, Takashi Matsui, Yoshiharu Utsumi, Hisanori Ohara
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Publication number: 20090026712Abstract: A sliding member is characterized in that a sliding surface of the sliding member is coated with an amorphous hard carbon film, and a surface of the amorphous hard carbon film has a ten-point mean roughness of equal to or less than 0.7 micrometers and an initial wear height in a range of 0.07 to 0.14 micrometers.Type: ApplicationFiled: August 27, 2008Publication date: January 29, 2009Inventors: Minoru Kawanishi, Ryo Wakabayashi, Masaki Moronuki, Katsuhiro Tsuji, Takayuki Sato
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Publication number: 20090011225Abstract: An amorphous hard carbon film comprising a first amorphous carbon layer substantially consists only of carbon formed on a substrate surface and a second amorphous carbon layer substantially consists only of carbon formed on the surface of the first amorphous carbon layer, wherein the transmission electron microscope image of the first amorphous carbon layer is brighter than that of the second amorphous carbon layer when the cross section is observed.Type: ApplicationFiled: November 28, 2006Publication date: January 8, 2009Inventors: Masaki Moronuki, Takashi Matsui, Yoshiharu Utsumi, Hisanori Ohara
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Patent number: 7156061Abstract: A valve lifter, in which an amorphous hard carbon film is coated at least on the surface that slides against a cam, is characterized in that the surface of a base material (substrate) has an arithmetic mean roughness of Ra 0.01 to 0.03 micrometers, and the maximum length of the scratch on the base surface is made to be equal to or shorter than 250 micrometers.Type: GrantFiled: February 1, 2006Date of Patent: January 2, 2007Assignees: Kabushiki Kaisha Riken, Nissan Motor Co., Ltd.Inventors: Takashi Matsui, Masaki Moronuki, Katsuhiro Tsuji, Yutaka Mabuchi, Takahiro Hamada, Hiroyuki Izumi, Tomoyuki Koike
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Publication number: 20060207540Abstract: A valve lifter, in which an amorphous hard carbon film is coated at least on the surface that slides against a cam, is characterized in that the surface of a base material (substrate) has an arithmetic mean roughness of Ra 0.01 to 0.03 micrometers, and the maximum length of the scratch on the base surface is made to be equal to or shorter than 250 micrometers.Type: ApplicationFiled: February 1, 2006Publication date: September 21, 2006Inventors: Takashi Matsui, Masaki Moronuki, Katsuhiro Tsuji, Yutaka Mabuchi, Takahiro Hamada, Hiroyuki Izumi, Tomoyuki Koike
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Patent number: 6821497Abstract: An amorphous hard carbon film has low friction coefficient from the beginning of sliding, when the metal oxide is contained in the film. The adhesion of the film to the substrate is also improved due to the low temperature treatment of RF plasma enhanced CVD method. This film can be applied to many sliding members, e.g., a piston ring, a vane of compressor and a plunger of fuel injection pump, used under severe condition.Type: GrantFiled: May 8, 2001Date of Patent: November 23, 2004Assignee: Kabushiki Kaisha RikenInventor: Masaki Moronuki